Clever product, and moderately useful both for squats and for use as a low stool.
Despite clear instructions and excellent packaging, I found assembly to be a pain, and while the springs themselves are quite beefy, the wood used for the base and top feels quite cheap. In the same week that the stool arrived, I happened to also receive another Chinese-manufactured wooden product which had been beautifully made and finished. The contrast between the two was dramatic.